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I felt pretty bad about it, but my curiosity took over :) It was only the power for their Energy Manager though, not the power to the entire apartment!

In any case, I doubt they were actually using this Energy Manager thing anyway. The number one feature listed on websites selling these things is "Earn two code credits under the code for sustainable homes". I assume you do not need to teach people how to use the thing to earn these credits...

https://uk-metering.net/products/netthings-energy-manager

that was only the power to the energy measuring device i believe.

Correct, since its only on a 3A fuse it would have blown as soon as the owner tried to make a coffee, if the house power literally ran through it.

Most likely this is just a current clamp style meter. Most of these kinds of meters are.

Next step - format all their SSDs to teach them to make backups :)